CN112255245A - Method and device for detecting appearance defects of front and back surfaces of Mini LED wafer - Google Patents
Method and device for detecting appearance defects of front and back surfaces of Mini LED wafer Download PDFInfo
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- CN112255245A CN112255245A CN202011513335.5A CN202011513335A CN112255245A CN 112255245 A CN112255245 A CN 112255245A CN 202011513335 A CN202011513335 A CN 202011513335A CN 112255245 A CN112255245 A CN 112255245A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/9501—Semiconductor wafers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
Abstract
The invention relates to a method and a device for detecting appearance defects of the front and back sides of a Mini LED wafer, wherein the method comprises the steps of front side station detection, positioning the position of a front side defect through a marking point, merging the position information of the front side defect and the front side defect into a Mini LED wafer information document, detecting the back side station, positioning the position of a back side defect through the marking point, merging the position information of the back side defect and the back side defect into the Mini LED wafer information document, and judging whether the wafer is qualified or not and sorting the wafer according to the Mini LED wafer information document by a sorting machine. The method and the device for detecting the defects of the front side and the back side of the Mini LED wafer solve the positioning problem in the defect detection of the back side of the Mini LED wafer, combine the detection information of the front side and the back side together to finish the defect detection of the front side and the back side of the Mini LED, and greatly improve the detection rate, the accuracy and the efficiency of the appearance defects of the Mini LED.
Description
Technical Field
The invention relates to the technical field of optical detection, in particular to a method and a device for detecting appearance defects of the front and back sides of a Mini LED wafer.
Background
In the existing Mini LED visual detection, machine vision needs to synchronize the detection result of each wafer into a wafer information document through the marking point of the Mini LED, and then a sorting machine sorts the wafers through the detection result. At present, the marking point of the Mini LED only exists on the front side, so that the positioning mark in the defect detection of the back side of the Mini LED is a big detection problem in machine vision.
Disclosure of Invention
Aiming at the defects of the prior art, the device and the method for detecting the appearance defects of the front and back sides of the wafer are disclosed, the defect information can be synchronized into the wafer information document through the marking point, and the sorting machine can sort out the defect wafer on the back side of the Mini LED, so that the detection method compatible with the front and back side appearance defect detection and the positioning mark of the Mini LED is provided, and the detection rate, the accuracy and the efficiency of the appearance defects of the Mini LED wafer are greatly improved.
The invention discloses a method for detecting appearance defects of the front and back sides of a Mini LED wafer, which comprises the following steps:
front station detection: placing a Mini LED wafer on a first carrying platform below a first detection lens of a front detection device, arranging the Mini LED wafer with the front side facing upwards, wherein the plane of the Mini LED wafer is vertical to the central axis of the first detection lens, the first carrying platform is a transparent carrying platform, a first annular light source is arranged above the Mini LED wafer, a first backlight source is arranged below the first carrying platform, the wafer is irradiated by the first annular light source and the first backlight source, the front side defect of the wafer is detected by a first detection camera, the position of the front side defect is positioned by a mark point, and the position information of the front side defect and the front side defect is combined into a Mini LED wafer information document;
after the front station detection is finished, the Mini LED wafer is conveyed to a back detection device for back station detection;
back station detection: arranging a Mini LED wafer on a second carrying platform above a second detection lens of a back detection device, arranging the back of the Mini LED wafer downwards, wherein the plane of the Mini LED wafer is vertical to the central axis of the second detection lens, the second carrying platform is a transparent carrying platform, a second combined light source is arranged below the Mini LED wafer, the second combined light source is formed by combining an annular light source and a prism coaxial light source, a second backlight source is arranged above the second carrying platform, the Mini LED wafer is irradiated by using the second combined light source and the second backlight source to enable a second detection camera to clearly image a mark point, the back defect of the Mini LED wafer is detected by the second detection camera, the position of the back defect is positioned by the mark point, and the position information of the back defect and the back defect is combined into a Mini LED wafer information document;
and the sorting machine judges whether the Mini LED wafer is qualified or not according to the Mini LED wafer information document and sorts according to the judgment result.
According to a preferred embodiment of the present invention, the second backlight is an infrared light backlight. The back defects of the Mini LED mainly comprise DBR back collapse, back scratch, surface dirt and edge collapse, and the back defects can be more clearly shown by combining an infrared light backlight source with a second combined light source formed by combining an annular light source and a prism coaxial light source.
According to a preferred embodiment of the present invention, the front side detection device further includes a point light source, and the point light source, the annular light source, and the backlight source are stroboscopically illuminated during the front side station detection. The stroboscopic lighting of the three light sources can well highlight various defects on the front surface of a product, such as electrode defect, electrode scratch/scratch, electrode dirt, electrode gold, electrode bubbling, poor scratch, inconsistent electrode direction, isolation groove dirt, substrate breakage, crystalline grain twin, PV front surface edge breakage, PV edge measurement and the like.
According to a preferred embodiment of the invention, the Mini LED wafer is vacuum-adsorbed on the first stage or the second stage during the front-side station detection and the back-side station detection. The Mini LED wafer to be tested is fixed in a vacuum adsorption mode, the connection is stable, and the installation is convenient.
According to a preferred embodiment of the invention, after the front-side station detection is finished, the Mini LED wafer is transported to the back-side detection device by using the mechanical arm. The wafer is transmitted and detected by the mechanical arm, so that the efficiency is improved, and the labor cost is reduced.
The invention also discloses a device for detecting the appearance defects of the front and back surfaces of the Mini LED wafer, which is suitable for the detection method, wherein the detection device comprises a front detection device, a back detection device, a transmission device and a sorting machine, and the front detection device comprises a first detection camera, a first lens, a point light source, a first annular light source, a first carrying platform and a first backlight source; the first detection camera, the first lens, the first annular light source, the first carrying platform and the first backlight source are coaxially arranged from top to bottom in sequence, and the first carrying platform is used for placing a Mini LED wafer;
the back detection device comprises a second detection camera, a second lens, a second combined light source, a second carrying platform and a second backlight source; the second detection camera, the second lens, the second combined light source, the second carrying platform and the second backlight source are coaxially arranged from bottom to top in sequence, and the second carrying platform is used for placing a Mini LED wafer;
the transmission device is used for moving the Mini LED wafer from the front detection device to the back detection device;
the sorting machine is used for judging whether the Mini LED wafers are qualified or not according to the Mini LED wafer information documents and sorting according to the judgment result.
According to a preferred embodiment of the present invention, the second combined light source is formed by combining an annular light source and a prism coaxial light source, and the second backlight source is an infrared light backlight source. The second combined light source formed by combining the annular light source and the prism coaxial light source by combining the infrared light backlight source and the second combined light source can more clearly present back defects.
According to a preferred embodiment of the present invention, the first stage and the second stage are glass stages, and a circle of air holes are arranged around the glass stages. The carrying platform is of the structure, so that the Mini LED wafer is conveniently adsorbed on the carrying platform in a vacuum mode.
According to a preferred embodiment of the present invention, the transport device is a mechanical arm, and the first detection lens and the second detection lens are telecentric lenses. According to a preferred embodiment of the present invention, the point light source is disposed at a middle position of the first detection lens.
The device and the method for detecting the defects of the back side of the Mini LED wafer not only solve the problem of detecting the defects of the front side of the Mini LED wafer, but also combine the detection information of the front side and the detection information of the back side through a back side imaging structure to complete the defect detection of the front side and the back side of the Mini LED wafer; the marking points can be clearly imaged when the defect on the back surface of the wafer is detected by a mode of punching the back surface of the Mini LED wafer to be detected, so that the technical problem of positioning and marking in the current detection process of the defect on the back surface of the Mini LED wafer is solved; the defects of the front side and the back side are combined into the wafer information document, so that the detection rate, the accuracy and the efficiency of the Mini LED appearance defects are greatly improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic view of the detection method of the present invention.
Fig. 2 is a schematic view of a front detection device in the detection device of the present invention.
Fig. 3 is a schematic view of a back side detection device in the detection device of the present invention.
Fig. 4 is a schematic diagram of a second combined light source of the back side detection device in the detection device of the present invention.
FIG. 5 illustrates front marker imaging in an embodiment of the present invention.
FIG. 6 is a backside marker imaging in an embodiment of the present invention.
Fig. 7 is a full thumbnail image of a Mini LED wafer in an embodiment of the invention.
1. A first detection camera; 2. a first lens; 3. a point light source; 4. a first annular light source; 5. a wafer to be tested; 6. a first stage; 7. a first backlight source; 11. a second detection camera; 12 a second lens; 14. a second combined light source; 141. an annular light source; 142. a prism coaxial light source; 17. a second backlight.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
FIG. 1 is a schematic diagram of the detection method of the present invention. The invention discloses a method for detecting appearance defects of the front and back sides of a Mini LED wafer, which comprises the following steps:
front station detection: placing a Mini LED wafer on a first carrying platform below a first detection lens of a front detection device, arranging the Mini LED wafer with the front side facing upwards, wherein the plane of the Mini LED wafer is vertical to the central axis of the first detection lens, the first carrying platform is a transparent carrying platform, a first annular light source is arranged above the Mini LED wafer, a first backlight source is arranged below the first carrying platform, the wafer is irradiated by the first annular light source and the first backlight source, the front side defect of the wafer is detected by a first detection camera, the position of the front side defect is positioned by a mark point, and the position information of the front side defect and the front side defect is combined into a Mini LED wafer information document;
after the front station detection is finished, the Mini LED wafer is conveyed to a back detection device for back station detection;
back station detection: arranging a Mini LED wafer on a second carrying platform above a second detection lens of a back detection device, arranging the back of the Mini LED wafer downwards, wherein the plane of the Mini LED wafer is vertical to the central axis of the second detection lens, the second carrying platform is a transparent carrying platform, a second combined light source is arranged below the Mini LED wafer, the second combined light source is formed by combining an annular light source and a prism coaxial light source, a second backlight source is arranged above the second carrying platform, the Mini LED wafer is irradiated by using the second combined light source and the second backlight source to enable a second detection camera to clearly image a mark point, the back defect of the Mini LED wafer is detected by the second detection camera, the position of the back defect is positioned by the mark point, and the position information of the back defect and the back defect is combined into a Mini LED wafer information document;
and the sorting machine judges whether the Mini LED wafer is qualified or not according to the Mini LED wafer information document and sorts according to the judgment result.
Optionally, the second backlight source is an infrared light backlight source. The back defects of the Mini LED mainly comprise DBR back collapse, back scratch, surface dirt and edge collapse, and the back defects can be more clearly shown by combining an infrared light backlight source with a second combined light source formed by combining an annular light source and a prism coaxial light source.
Optionally, the front side detection device further comprises a point light source, when the front side station is detected, the point light source, the annular light source and the backlight source are used for stroboscopic lighting, and the point light source can be a high-brightness RB point light source. The stroboscopic lighting of the three light sources can well highlight various defects on the front surface of a product, such as electrode defect, electrode scratch/scratch, electrode dirt, electrode gold, electrode bubbling, poor scratch, inconsistent electrode direction, isolation groove dirt, substrate breakage, crystalline grain twin, PV front surface edge breakage, PV edge measurement and the like.
Optionally, during the front station detection and the back station detection, the Mini LED wafer is vacuum-adsorbed on the first carrying table or the second carrying table. The Mini LED wafer to be tested is fixed in a vacuum adsorption mode, the connection is stable, and the installation is convenient.
Optionally, after the front station detection is finished, the Mini LED wafer is conveyed to the back detection device by using the mechanical arm. The wafer is transmitted and detected by the mechanical arm, so that the efficiency is improved, and the labor cost is reduced.
As shown in fig. 2 and 3, the schematic diagrams of a front side detection device and a back side detection device in the detection device of the present invention also discloses a device for detecting appearance defects of the front and back sides of a Mini LED wafer, which is suitable for the detection method described above, wherein the detection device includes a front side detection device, a back side detection device, a transmission device, and a sorter, and the front side detection device includes a first detection camera 1, a first lens 2, a point light source 3, a first annular light source 4, a first carrier 6, and a first backlight 7; the first detection camera, the first lens, the first annular light source, the first carrying platform and the first backlight source are coaxially arranged from top to bottom in sequence, and the first carrying platform is used for placing a Mini LED wafer;
the back surface detection device includes a second detection camera 11, a second lens 12, a second combined light source 14, a second stage (not shown), and a second backlight source 17; the second detection camera, the second lens, the second combined light source, the second carrying platform and the second backlight source are coaxially arranged from bottom to top in sequence, and the second carrying platform is used for placing a Mini LED wafer;
the transmission device is used for moving the Mini LED wafer from the front detection device to the back detection device;
the sorting machine is used for judging whether the Mini LED wafers are qualified or not according to the Mini LED wafer information documents and sorting according to the judgment result.
As shown in fig. 4, optionally, the second combined light source is formed by combining an annular light source 141 and a prism coaxial light source 142, and the second backlight source is an infrared light backlight source. The second combined light source formed by combining the annular light source and the prism coaxial light source by combining the infrared light backlight source and the second combined light source can more clearly present back defects.
Optionally, the first carrying table and the second carrying table are glass carrying tables, and a circle of air holes are formed in the periphery of each glass carrying table. The carrying platform is of the structure, so that the Mini LED wafer is conveniently adsorbed on the carrying platform in a vacuum mode.
Optionally, the transmission device is a mechanical arm, and the first detection lens and the second detection lens are telecentric lenses. According to a preferred embodiment of the present invention, the point light source is disposed at a middle position of the first detection lens.
Fig. 5 and 6 show front and back side mark points for imaging, the mark points are shown in a frame, fig. 7 shows a complete thumbnail image of a Mini LED wafer in an embodiment of the invention, and black points in fig. 6 are mark points.
The device and the method for detecting the defects of the back side of the Mini LED wafer not only solve the problem of detecting the defects of the front side of the Mini LED wafer, but also combine the detection information of the front side and the detection information of the back side through a back side imaging structure to complete the defect detection of the front side and the back side of the Mini LED wafer; the marking points can be clearly imaged when the defect on the back surface of the wafer is detected by a mode of punching the back surface of the Mini LED wafer to be detected, so that the technical problem of positioning and marking in the current detection process of the defect on the back surface of the Mini LED wafer is solved; the defects of the front side and the back side are combined into the wafer information document, so that the detection rate, the accuracy and the efficiency of the Mini LED appearance defects are greatly improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method for detecting appearance defects of the front side and the back side of a Mini LED wafer is characterized by comprising the following steps: the method comprises the following steps:
front station detection: placing a Mini LED wafer on a first carrying platform below a first detection lens of a front detection device, arranging the Mini LED wafer with the front side facing upwards, wherein the plane of the Mini LED wafer is vertical to the central axis of the first detection lens, the first carrying platform is a transparent carrying platform, a point light source is arranged in the middle of the first detection lens, a first annular light source is arranged above the Mini LED wafer, a first backlight source is arranged below the first carrying platform, the point light source, the first annular light source and the first backlight source are used for irradiating the wafer, the front defect of the wafer is detected through a first detection camera, the position of the front defect is positioned through a mark point, and the position information of the front defect are combined into a Mini LED wafer information document;
after the front station detection is finished, the Mini LED wafer is conveyed to a back detection device for back station detection;
back station detection: arranging a Mini LED wafer on a second carrying platform above a second detection lens of a back detection device, arranging the back of the Mini LED wafer downwards, wherein the plane of the Mini LED wafer is vertical to the central axis of the second detection lens, the second carrying platform is a transparent carrying platform, a second combined light source is arranged below the Mini LED wafer, the second combined light source is formed by combining an annular light source and a prism coaxial light source, a second backlight source is arranged above the second carrying platform, the Mini LED wafer is irradiated by using the second combined light source and the second backlight source to enable a second detection camera to clearly image a mark point, the back defect of the Mini LED wafer is detected by the second detection camera, the position of the back defect is positioned by the mark point, and the position information of the back defect and the back defect is combined into a Mini LED wafer information document;
and the sorting machine judges whether the Mini LED wafer is qualified or not according to the Mini LED wafer information document and sorts according to the judgment result.
2. The method for detecting the appearance defects of the front and back surfaces of the Mini LED wafer according to claim 1, wherein the method comprises the following steps: the second backlight source is an infrared light backlight source.
3. The method for detecting the appearance defects of the front and back surfaces of the Mini LED wafer according to claim 1, wherein the method comprises the following steps: when the front station is detected, a point light source, an annular light source and a backlight source are used for stroboscopic lighting.
4. The method for detecting the appearance defects of the front and back surfaces of the Mini LED wafer according to claim 1, wherein the method comprises the following steps: and when the front station and the back station are detected, the Mini LED wafer is adsorbed on the first carrying table or the second carrying table in a vacuum manner.
5. The method for detecting the appearance defects of the front and back surfaces of the Mini LED wafer according to claim 1, wherein the method comprises the following steps: and after the front station detection is finished, the Mini LED wafer is conveyed to the back detection device by using the mechanical arm.
6. The utility model provides a Mini LED wafer positive and negative face appearance defect detection device which characterized in that: the detection method is suitable for any one of claims 1 to 5, the detection device comprises a front detection device, a back detection device, a transmission device and a sorting machine, the front detection device comprises a first detection camera, a first lens, a point light source, a first annular light source, a first carrying platform and a first backlight source; the first detection camera, the first lens, the first annular light source, the first carrying platform and the first backlight source are coaxially arranged from top to bottom in sequence, and the first carrying platform is used for placing a Mini LED wafer;
the back detection device comprises a second detection camera, a second lens, a second combined light source, a second carrying platform and a second backlight source; the second detection camera, the second lens, the second combined light source, the second carrying platform and the second backlight source are coaxially arranged from bottom to top in sequence, and the second carrying platform is used for placing a Mini LED wafer;
the transmission device is used for moving the Mini LED wafer from the front detection device to the back detection device;
the sorting machine is used for judging whether the Mini LED wafers are qualified or not according to the Mini LED wafer information documents and sorting according to the judgment result.
7. The device of claim 6, wherein the device for detecting the appearance defects of the front and back sides of the Mini LED wafer comprises: the second combined light source is formed by combining an annular light source and a prism coaxial light source, and the second backlight source is an infrared light backlight source.
8. The device of claim 6, wherein the device for detecting the appearance defects of the front and back sides of the Mini LED wafer comprises: the first carrying platform and the second carrying platform are glass carrying platforms, and a circle of air holes are formed in the periphery of each glass carrying platform.
9. The device of claim 6, wherein the device for detecting the appearance defects of the front and back sides of the Mini LED wafer comprises: the transmission device is a mechanical arm, and the first detection lens and the second detection lens are telecentric lenses.
10. The device of claim 6, wherein the device for detecting the appearance defects of the front and back sides of the Mini LED wafer comprises: the point light source is arranged in the middle of the first detection lens.
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| CN112924472A (en) * | 2021-02-09 | 2021-06-08 | 惠州高视科技有限公司 | Mini LED wafer appearance defect detection system and method |
| CN112927192A (en) * | 2021-01-29 | 2021-06-08 | 中芯集成电路制造(绍兴)有限公司 | Method for marking ink dots on wafer |
| CN113984785A (en) * | 2021-10-21 | 2022-01-28 | 上海帆声图像科技有限公司 | Module appearance re-judging and detecting equipment |
| CN114486737A (en) * | 2022-01-17 | 2022-05-13 | 东莞市合易自动化科技有限公司 | Visual detection equipment capable of high-precision positioning MiniLED wafer lighting effect |
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| CN114473241A (en) * | 2022-03-04 | 2022-05-13 | 安徽熙泰智能科技有限公司 | Bright point repairing method suitable for Micro OLED |
| CN114473241B (en) * | 2022-03-04 | 2023-11-07 | 安徽熙泰智能科技有限公司 | Bright spot repairing method suitable for Micro OLED |
| CN114758969A (en) * | 2022-04-18 | 2022-07-15 | 无锡九霄科技有限公司 | Wafer back visual detection structure, detection method and related equipment |
| CN114758969B (en) * | 2022-04-18 | 2023-09-12 | 无锡九霄科技有限公司 | Wafer back vision detection structure, detection method and related equipment |
| CN114994079A (en) * | 2022-08-01 | 2022-09-02 | 苏州高视半导体技术有限公司 | Optical assembly and optical system for wafer detection |
| CN114994079B (en) * | 2022-08-01 | 2022-12-02 | 苏州高视半导体技术有限公司 | Optical assembly and optical system for wafer detection |
| CN115128099A (en) * | 2022-08-29 | 2022-09-30 | 苏州高视半导体技术有限公司 | Wafer defect detection method, wafer defect detection equipment and shooting device thereof |
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